Knot untier



FIG. 1 is a view of the knot untier as seen from above. View from below is the same.

FIG. 2 is a view of the knot untier as seen from the end with the arms.

FIG. 3 is a view of the knot untier as seen from the end opposite to the arms; and,

FIG. 4 is a view of the knot untier from the side. View from the other side is the same. 

CLAIM I claim, the ornamental design for a knot untier, as shown and described. 